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3 cards from this section. Quick, good the night before a test.
What is friction?
Think about experiences where things don’t slide easily.
Name two types of friction.
One prevents motion and one opposes it.
What type of friction opposes the start of motion?
Think about how difficult it is to start moving a stationary object.
True or False: Kinetic friction is generally stronger than static friction.
Consider how much force it takes to start versus continue moving an object.
A sled weighing 60 kg slides down a hill at a coefficient of kinetic friction of 0.2. Calculate the frictional force acting on the sled while sliding.
Remember to find the normal force first!
If the coefficient of static friction between a car tire and the road is 0.7, what is the maximum static frictional force that can act on a 1000 kg car?
Start by finding the weight of the car to determine the normal force.
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